<template>
      <div id="aCoursesList" class="bg-fa of">
        <!-- /课程列表 开始 -->
        <section class="container">
          <header class="comm-title">
            <h2 class="fl tac">
              <span class="c-333">全部课程</span>
            </h2>
          </header>
          <section class="c-sort-box">
            <section class="c-s-dl">
              <dl>
                <dt>
                  <span class="c-999 fsize14">课程类别</span>
                </dt>
                <dd class="c-s-dl-li">
                  <ul class="clearfix">
                    <li>
                      <a title="全部" href="#">全部</a>
                    </li>
                    <li v-for="(item,index) in subjectNestedList" :key="index" :class="{active:oneIndex==index}">
                      <a :title="item.title" href="#" @click="searchOne(item.id,index)">{{ item.title }}</a>
                    </li>
                  </ul>
                </dd>
              </dl>
              <dl>
                <dt>
                  <span class="c-999 fsize14"></span>
                </dt>
                <dd class="c-s-dl-li">
                  <ul class="clearfix">
                    <li v-for="(item,index) in subSubjectList" :key="index" :class="{active:twoIndex==index}">
                      <a :title="item.title" href="#" @click="searchTwo(item.id,index)">{{item.title}}</a>
                    </li>
                  </ul>
                </dd>
              </dl>
              <div class="clear"></div>
            </section>
            <div class="js-wrap">
              <section class="fr">
                <span class="c-ccc">
                  <i class="c-master f-fM">1</i>/
                  <i class="c-666 f-fM">1</i>
                </span>
              </section>
              <section class="fl">
                <ol class="js-tap clearfix">
                  <li :class="{'current bg-orange':buyCountSort!=''}">
                    <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                    <span :class="{hide:buyCountSort==''}">↓</span>
                    </a>
                  </li>
                  <li :class="{'current bg-orange':gmtCreateSort!=''}">
                    <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                    <span :class="{hide:gmtCreateSort==''}">↓</span>
                    </a>
                  </li>
                  <li :class="{'current bg-orange':priceSort!=''}">
                    <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                      <span :class="{hide:priceSort==''}">↓</span>
                    </a>
                  </li>
                </ol>
              </section>
            </div>
            <div class="mt40">
              <!-- /无数据提示 开始-->
              <section class="no-data-wrap" v-if="data.total==0">
                <em class="icon30 no-data-ico">&nbsp;</em>
                <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
              </section>
              <!-- /无数据提示 结束-->
              <article v-if="data.total>0" class="comm-course-list">
                <ul class="of" id="bna">
                  <li v-for="item in data.items" :key="item.id">
                    <div class="cc-l-wrap">
                      <section class="course-img">
                        <img :src="item.cover" class="img-responsive" :alt="item.title">
                        <div class="cc-mask">
                          <a :href="'/course/' + item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                        </div>
                      </section>
                      <h3 class="hLh30 txtOf mt10">
                        <a :href="'/course/' + item.id" :title="item.title" class="course-title fsize18 c-333">{{item.title}}</a>
                      </h3>
                      <section class="mt10 hLh20 of">
                        <!-- v-if="Number(item.price) === 0" -->
                        <span class="fr jgTag bg-green"><!-- v-if="Number(item.price) === 0" -->
                          <i class="c-fff fsize12 f-fA">{{ item.price===0?'免费':item.price }}</i>
                        </span>
                        <span class="fl jgAttr c-ccc f-fA">
                          <i class="c-999 f-fA">9634人学习</i>
                          |
                          <i class="c-999 f-fA">9634评论</i>
                        </span>
                      </section>
                    </div>
                  </li>
                </ul>
                <div class="clear"></div>
              </article>
            </div>

            <div>
              <div class="paging">
                <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
                <a
                  :class="{undisable: !data.hasPrevious}"
                  href="#"
                  title="首页"
                  @click.prevent="gotoPage(1)">首</a>
                <a
                  :class="{undisable: !data.hasPrevious}"
                  href="#"
                  title="前一页"
                  @click.prevent="gotoPage(data.current-1)">&lt;</a>
                <a
                  v-for="page in data.pages"
                  :key="page"
                  :class="{current: data.current == page, undisable: data.current == page}"
                  :title="'第'+page+'页'"
                  href="#"
                  @click.prevent="gotoPage(page)">{{ page }}</a>
                <a
                  :class="{undisable: !data.hasNext}"
                  href="#"
                  title="后一页"
                  @click.prevent="gotoPage(data.current+1)">&gt;</a>
                <a
                  :class="{undisable: !data.hasNext}"
                  href="#"
                  title="末页"
                  @click.prevent="gotoPage(data.pages)">末</a>
                <div class="clear"/>
              </div>
          </div>

          </section>
        </section>
        <!-- /课程列表 结束 -->
      </div>
</template>
<script>
import courseApi from '@/api/course'

export default {
  data() {
    return {
      page:1,//当前页
      data:{},//课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表

      searchObj: {}, // 查询表单对象

      oneIndex:-1,
      twoIndex:-1,
      buyCountSort:"",//关注度
      gmtCreateSort:"",//最新
      priceSort:""//价格
    }
  },
  created() {
    //课程第一次查询
    this.initCourseFirst()
    //一级分类显示
    this.initSubject()
  },
  methods: {
    //1 查询第一页数据
    initCourseFirst(){
      courseApi.getCourseList(1,8,this.searchObj)
        .then(response => {
          this.data = response.data.data
        })
    },

    //2 查询所有一级分类
    initSubject(){
      courseApi.getAllSubject()
        .then(response => {
          this.subjectNestedList = response.data.data.list
        })
    },

    //3 分页切换的方法
    gotoPage(page){
      if(page>this.data.pages){
        page = this.data.pages
      }
      courseApi.getCourseList(page,8,this.searchObj)
        .then(response => {
          this.data = response.data.data
        })
    },

    //4 点击某个一级分类，查询对应二级分类
    searchOne(subjectParentId,index){
      //把传递过来的index值复制给oneIndex，为了active样式生效
      this.oneIndex = index

      this.twoIndex = -1
      this.searchObj.subjectId = ""
      this.subSubjectList = []

      //把一级分类点击id值，赋值给searchObj
      this.searchObj.subjectParentId = subjectParentId
      //点击某个一级分类进行条件查询
      this.gotoPage(1)

      //拿着点击一级分类id 和 所有一级分类id进行比较
      //如果id相同，从一级分类里面获取对应的二级分类
      for(let i=0;i<this.subjectNestedList.length;i++){
        //获取每个一级分类
        var oneSubject = this.subjectNestedList[i]
        //比较id是否相同
        if(subjectParentId == oneSubject.id){
          //从一级分类里面获取对应的二级分类
          this.subSubjectList = oneSubject.children
        }
      }
    },

    //5 点击某个二级分类实现查询
    searchTwo(subjectId,index){
      //把index赋值,为了样式生效
      this.twoIndex = index
      //把二级分类点击id值，赋值给searchObj
      this.searchObj.subjectId = subjectId
      //点击某个一级分类进行条件查询
      this.gotoPage(1)
    },

    //6 根据销量排序
    searchBuyCount(){
      //设置对应变量值，为了样式生效
      this.buyCountSort = "1"
      this.gmtCreateSort = ""
      this.priceSort = ""

      //把值复制到searchObj
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      //调用方法查询
      this.gotoPage(1)
    },

    //7 最新排序
    searchGmtCreate(){
      //设置对应变量值，为了样式生效
      this.buyCountSort = ""
      this.gmtCreateSort = "1"
      this.priceSort = ""

      //把值复制到searchObj
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      //调用方法查询
      this.gotoPage(1)
    },

    //8 价格排序
    searchPrice(){
      //设置对应变量值，为了样式生效
      this.buyCountSort = ""
      this.gmtCreateSort = ""
      this.priceSort = "1"

      //把值复制到searchObj
      this.searchObj.buyCountSort = this.buyCountSort
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      //调用方法查询
      this.gotoPage(1)
    }

  },
};
</script>

<style scoped>
  .active {
    background: #bdbdbd;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>